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聚对苯二甲酸丙二醇酯/聚对苯二甲酸乙二醇酯(PTT/PET)复合纤维具有稳定且高度螺旋的卷曲结构,为改善其抗静电性能,采用碳纳米管(CNT)/炭黑(CB)复合填料对PTT进行共混改性。将不同质量比的CNT,CB及PTT共混挤出,制备出用于纺丝的CNT/CB/PTT共混切片,CNT/CB/PTT共混切片与PET切片复合纺丝制备CNT-CB协同改性PTT/PET复合纤维,并对复合纤维的导电性能进行表征。结果表明:采用质量分数1%的CNT和质量分数10%的CB作为导电填料对PTT改性,导电粒子在PTT基体中未出现明显的团聚,且CNT和CB可以形成较为完善的复合导电通路,制备的CNT/CB/PTT共混切片可用于纺丝;将CNT/CB/PTT共混切片与PET切片按质量比50∶50进行复合纺丝,制得的复合纤维具有良好的导电性能;随拉伸倍数的提高,复合纤维的体积电阻率呈下降趋势,但拉伸倍数过高,会损坏CB与CNT在PTT基体中形成的导电网络,当拉伸倍数为3. 3时,未改性的PTT/PET复合纤维体积电阻率为3. 58×10~9Ω·cm,而改性复合纤维的体积电阻率下降至5. 44×10~6Ω·cm。 相似文献
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将纳米组装高分子(PEEM)作为载体,使碳纳米管(CNT)及金属氧化物在其中充分分散,分别制成CNT母粒和导电剂,再与聚酯切片共混纺丝制备导电PET纤维。探讨了CNT母粒含量、导电剂含量、导电剂/CNT母粒配比、纤维的导电性能以及导电纤维的耐洗涤性、力学性能。研究结果表明:在CNT质量分数为0.18%、导电剂质量分数为2%时,制得导电PET纤维的体积比电阻为3.86×108 Ω·cm,且力学性能较纯PET下降不大。通过浸泡水洗,其体积比电阻基本不变,说明其具有优良、比较稳定的导电性和耐洗涤性。对纤维导电机理做了初步探讨。 相似文献
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多壁碳纳米管/高密度聚乙烯复合材料的导电行为研究 总被引:1,自引:0,他引:1
采用超声波分散溶液混合法,制备出导电性能优良的多壁碳纳米管(MWNTs)/高密度聚乙烯(HDPE)导电复合材料。研究了不同含量及长径比的MWNTs对HDPE导电性能的影响。结果表明:MWNTs可以显著提高复合材料的导电性,其体积电阻率由1017Ω.m降至107Ω.m;长径比较小的MWNTs分散性较好,并能显著提高材料的PTC(正温度系数效应)强度,当w(MWNTs-60100)=7%(相对于材料总质量而言)时,材料的PTC强度达到2.8。采用差示扫描量热(DSC)法分析了复合材料的结晶行为,证明MWNTs可以成为HDPE的成核剂,并能提高HDPE的成核速率,使晶粒尺寸分布变窄。 相似文献
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比利时碳纳米管(CNT)生产厂Nanocyl公司在广州塑料展览会上推出了最新CNT母料Plasticyl.可以应用于导电和防止静电。 相似文献
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紫外光辐照反-1,4-聚异戊二烯/碳纳米管复合材料 总被引:2,自引:3,他引:2
在室温和氮气环境下 ,用反 - 1,4 -聚异戊二烯 (TPI)与碳纳米管 (CNT)经紫外光辐照制备了TPI/CNT复合材料。实验表明 ,TPI与CNT的复合材料或二者直接共混物的电阻率 (ρv)均随CNT质量分数的增加而下降 ;前者的导电性优于后者。CNT质量分数为 5 %时 ,TPI/CNT复合材料的 ρv 与TPI相比 ,下降了 7个数量级 ,为 6 .0 7× 10 8Ω·cm。在紫外光辐照下 ,CNT可在TPI基质中均匀分布 ,形成导电网络 相似文献
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采用液相共沉法制备了体积电阻率在50 Ω·cm以下的掺杂碳纳米管(CNTs)的复合导电云母粉.研究了pH值、SnO2-Sb2O3包覆率,Sn/Sb掺杂比、煅烧温度、煅烧时间,以及CNTs掺杂量对粉体体积电阻率的影响.结果表明,在达到相同导电性能的情况下,掺杂0.2%以下的CNTs可降低SnO2O-Sb2O3包覆量50%,导电云母粉完全能满足制备浅色导静电涂料的要求. 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
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A refined nonlinear value of the main parameter of a material, i.e., the elongation modulus versus the instant temperature value, was suggested for introduction into the computational algorithm of tempering stresses. 相似文献